The United States and Iran have accused each other of failing to implement a memorandum of understanding intended to end hostilities between the two nations.

This diplomatic breakdown threatens a fragile peace process and raises the risk of renewed conflict if neither side adheres to the agreed-upon provisions.

The memorandum of understanding was first publicly referenced on June 15, 2026 [1]. Since then, both governments have used diplomatic channels, including the U.S. State Department and a U.S. political institution, to communicate their grievances.

A spokesperson for the U.S. State Department said Iran has not met its commitments under the agreement [1]. The U.S. position suggests that the failure to adhere to the document's terms is a breach of the preliminary agreement.

Tehran has rejected these assertions. A spokesperson for the Iranian Foreign Ministry said, "Iran will fulfill its obligations as long as the opposite party adheres to them."

Further complications exist regarding the current stage of the peace process. An Iranian official said on June 29, 2026, that "the transition to the negotiation phase has not started yet" [2]. This contradicts reports that a preliminary agreement to end the war had already been established by the U.S., Iran, and Pakistan [1].

Both parties have warned that they may retaliate if the violations continue. The Iranian Foreign Ministry said that the U.S. is not complying with the terms of the memorandum [3].

The dispute centers on whether the initial terms of the agreement have been satisfied enough to move into formal negotiations. While the U.S. maintains that Iran is in breach, Tehran asserts that its cooperation is contingent upon American compliance.

“Iran will fulfill its obligations as long as the opposite party adheres to them”

The mutual accusations indicate a significant gap in how both nations interpret the triggers for the next phase of the peace process. Because the agreement is a memorandum of understanding rather than a formal treaty, it lacks rigid enforcement mechanisms, leaving the process vulnerable to unilateral interpretations and the threat of retaliation.